President Trump speaks in the Roosevelt Room of the White House. (Evan Vucci / AP)

President Trump is hitting a wall with the public on his national emergency declaration.

Most American voters — two-thirds — oppose Trump’s controversial order seeking to build a Mexican border wall without congressional approval, according to a poll released Wednesday, as Republican support on the issue also appeared to fissure.

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A significant 66% of voters say Trump’s wall-obsessed Feb. 15 declaration is unconstitutional and shouldn’t have been issued, according to the new survey by Quinnipiac University. In contrast, only 31% support the constitutionally questionable maneuver.

“‘We didn’t want it in the first place and we certainly don’t want it built by emergency executive order,’ say wall-weary voters in big numbers,” according to Tim Malloy, the assistant director of the Quinnipiac poll.

Registered Republicans are the only voters who overwhelmingly support Trump’s order, with 69% approving of it and 29% opposing, according to the poll. All other party affiliations, gender, education, age and ethnicity groups disapprove of the declaration, Quinnipiac found.

The widespread discontent with Trump’s do-it-alone attitude on the wall comes as Republicans are breaking with the President ahead of a Senate vote on a resolution seeking to block his order.

Kentucky Sen. Rand Paul told reporters Tuesday that he and about nine of his GOP colleagues will vote to block the emergency order when it comes up for a vote in the coming weeks. Only four Republican senators need to break ranks in order for the measure to pass, assuming all Democrats approve it.

The Democratically-controlled House has already passed the measure, which seeks to bar Trump from taking $8 billion from Pentagon reserve budgets and use it for the construction of a wall along the Mexican border.

Trump’s emergency appropriation flies in the face of the $1.4 billion in taxpayer cash that Congress approved for the construction of bollard fencing on the border.

However, even if the Senate passes the emergency-blocking provision, Trump has made clear he intends to issue the first veto of his presidency in order to keep his dream of a massive border wall alive.

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At that point, it will be up to the courts whether Trump’s order is constitutional. A litany of legal challenges have been filed asking federal judges to block Trump’s order, arguing there isn’t a crisis on the border and that the President has violated the Constitution by circumventing Congress’s power of the purse.

“Senate Republicans are not voting on constitutionality or precedent, they are voting on desperately needed Border Security & the Wall,” Trump tweeted. “Our Country is being invaded with Drugs, Human Traffickers, & Criminals of all shapes and sizes. That’s what this vote is all about.”